Hi Peter,
Can you tell me where you are seeing the £11.20 fare, please. I can’t find it.
Within zones 1-9 the EL fares are set by TfL and are the same as used on the Underground. Cash fares are significantly more expensive to try and push most people to use PAYG.
Fares to Heathrow EL stations include a supplement charged by the airport who own the tracks between Airport Junction and the Terminals.